Once again Rui Santos brings us another simple yet useful Arduino tutorial. In his latest instalment he demonstrates how to control an Arduino using text commands over serial via Bluetooth. A lot of people consider this to be difficult, however with the freely-available "Blueterm" Android app you can send and receive text - which an Arduino can easily receive and act upon. For the demonstration Rui controls a DC motor with an L293D motor controller IC which is useful in itself, for example:

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